Jack tree latex has the same composition as the fruit gum. Besides proteins and mineral substances, the two contain a high percentage of waxy matter. The less soluble portion (small amount) of the wax yields on saponification a non-steroid substance melting at 96-7° and having probable composition of C30H58O2. The more soluble major fraction yields artostenone on saponification. Experiments indicate definitely that this ketone is not occurring free and that it is formed as a result of the saponification. Though artostenone does not have the capacity of forming enolesters, α-artostenone yields an enol-benzoate readily. Further α-artostenone and its enol-ester undergo conversion into artostenone under the conditions of saponification. Hence the conclusion is drawn that in the plant it is α-artostenone that occurs in the form of enol-wax-esters.